Basically, this just adds a dolphin chirping(?) sound to Marth's up special. It is called DOLPHIN Slash after all, and if Falcon Punch can make a Falcon noise, Dolphin Slash can make a Dolphin noise.

In case you already have a voice mod on Marth and just want to add the dolphin sound, download the .wav here: https://www.dropbox.com/s/7zbbw8n2plneyls/dolphin%20slash.wav
and replace Audio[34] under Marth's [219] RWSD (51269)

EDIT: If you are having issues with the default sounds playing, follow these 4 steps:
1) Make sure you have Mewtwo's 323.sawnd loaded in Super Sawndz.
2) Close Super Sawndz, and delete 323.sawnd from your sd card.
3) Manually replace the victory quotes in Super Sawndz using the .wavs I have provided.
4) Save your new .sawnd as 323.sawnd, and put it on your sd card.

I noticed no one made this, so in case anyone wants it, here you go; this file replaces Mewtwo's victory laughs/groans with his Japanese win quotes. I noticed that PM Mewtwo had 1 of his quotes, so I just gave him the other two. The file also includes the .wavs for the quotes in case you need them for anything.

I noticed the default stocks look like the heads of the default portraits, so I made all the stocks based on SJS's CSPs.
Replace MiscData90 in sc_selcharacter.pac to use on the CSS.
Replace MiscData40 in sc_selmap.pac to use on the SSS.
Replace MiscData120 in STGRESULT.pac to use on the results screen.
Credit to SJS for making these amazing CSPs, and for allowing me to release.